{"id":360,"date":"2023-12-07T03:12:42","date_gmt":"2023-12-07T00:12:42","guid":{"rendered":"https:\/\/sms-txt.net\/?p=360"},"modified":"2024-09-05T12:44:42","modified_gmt":"2024-09-05T09:44:42","slug":"ss7-zachyceni-volani","status":"publish","type":"post","link":"https:\/\/sms-txt.net\/cs\/zachyceni-hovoru\/ss7-zachyceni-volani\/","title":{"rendered":"Odposlech hovor\u016f SS7"},"content":{"rendered":"<p>Mobiln\u00ed \u00fast\u0159edna MSC obvykle uchov\u00e1v\u00e1 \u0161ifrovac\u00ed kl\u00ed\u010de pou\u017e\u00edvan\u00e9 jednotliv\u00fdmi \u00fa\u010dastn\u00edky, aby bylo mo\u017en\u00e9 nav\u00e1zat hovor. Kdy\u017e je \u00fa\u010dastn\u00edk na cest\u00e1ch, proces p\u0159ed\u00e1n\u00ed usnad\u0148uje hladk\u00fd p\u0159echod \u00fa\u010dastn\u00edka mezi r\u016fzn\u00fdmi r\u00e1diov\u00fdmi bu\u0148kami a z\u00e1rove\u0148 zachov\u00e1v\u00e1 pr\u016fb\u011bh hovoru.<\/p>\n<p>V n\u011bkter\u00fdch p\u0159\u00edpadech se \u00fa\u010dastn\u00edk p\u0159esune z jedn\u00e9 bu\u0148ky do jin\u00e9, kter\u00e1 je spravov\u00e1na jin\u00fdm VLR. V takov\u00e9m p\u0159\u00edpad\u011b nem\u00e1 nov\u00fd VLR zpo\u010d\u00e1tku k dispozici autentiza\u010dn\u00ed informace, kter\u00e9 by usnadnily zachov\u00e1n\u00ed vol\u00e1n\u00ed, a proto je k p\u0159enosu kl\u00ed\u010d\u016f do nov\u00e9ho MSC zapot\u0159eb\u00ed proces p\u0159ed\u00e1n\u00ed mezi MSC.<\/p>\n<p>To se prov\u00e1d\u00ed prost\u0159ednictv\u00edm zpr\u00e1vy MAP s n\u00e1zvem sendIdentification. Nov\u00fd VLR ode\u0161le zpr\u00e1vu sendIdentification star\u00e9mu VLR, kter\u00fd na ni odpov\u00ed kl\u00ed\u010di pot\u0159ebn\u00fdmi k zachov\u00e1n\u00ed prob\u00edhaj\u00edc\u00edho vol\u00e1n\u00ed.  Mezi tyto kl\u00ed\u010de pat\u0159\u00ed kl\u00ed\u010d pou\u017e\u00edvan\u00fd k \u0161ifrov\u00e1n\u00ed p\u0159enos\u016f vzduchem. Ve sc\u00e9n\u00e1\u0159i \u00fatoku \u00fato\u010dn\u00edk zachyt\u00ed provoz c\u00edle p\u0159es vzdu\u0161n\u00e9 rozhran\u00ed (co\u017e vy\u017eaduje fyzickou bl\u00edzkost c\u00edle).<\/p>\n<p>S p\u0159\u00edstupem k SS7 pak m\u016f\u017ee pomoc\u00ed zpr\u00e1vy sendIdentification z\u00edskat de\u0161ifrovac\u00ed kl\u00ed\u010de pro c\u00edl a pou\u017e\u00edt je k de\u0161ifrov\u00e1n\u00ed provozu. Zpr\u00e1va sendIdentification je pot\u0159ebn\u00e1 pouze v r\u00e1mci vnit\u0159n\u00ed s\u00edt\u011b p\u0159i<br \/>\np\u0159ed\u00e1n\u00ed. Nem\u011bla by m\u00edt \u017e\u00e1dn\u00e9 legitimn\u00ed pou\u017eit\u00ed zven\u010d\u00ed, a proto by m\u011bla b\u00fdt na hranici filtrov\u00e1na.<\/p>\n<h2>Zachycen\u00ed odchoz\u00edch hovor\u016f<\/h2>\n<p>Funkce \u0159\u00edzen\u00ed slu\u017eby GSM (gsmSCF) je funk\u010dn\u00ed entita, kter\u00e1 obsahuje logiku slu\u017eby CAMEL, je\u017e pro ur\u010ditou sadu ud\u00e1lost\u00ed s jistotou rozhoduje, zda po\u017eadovan\u00e1 akce m\u016f\u017ee pokra\u010dovat zm\u011bn\u011bn\u00e1, nezm\u011bn\u011bn\u00e1 nebo p\u0159eru\u0161en\u00e1. Lze ji nap\u0159\u00edklad pou\u017e\u00edt k \u00faprav\u011b odchoz\u00edch \u010d\u00edsel p\u0159id\u00e1n\u00edm sm\u011brov\u00e9ho \u010d\u00edsla nebo mezin\u00e1rodn\u00edho form\u00e1tu.<\/p>\n<p>\u00dato\u010dn\u00edk s p\u0159\u00edstupem k SS7 m\u016f\u017ee pomoc\u00ed zpr\u00e1vy insertSubscriberData zm\u011bnit adresu gsmSCF \u00fa\u010dastn\u00edka na adresu pod svou kontrolou. \u00dato\u010dn\u00edk pak m\u016f\u017ee p\u0159epsat odchoz\u00ed volan\u00e1 \u010d\u00edsla na \u010d\u00edslo pod svou kontrolou. V takov\u00e9m p\u0159\u00edpad\u011b \u00fato\u010dn\u00edk p\u0159ijme odchoz\u00ed vol\u00e1n\u00ed, nahraje hovor a teprve pot\u00e9 p\u0159ed\u00e1 provoz kone\u010dn\u00e9mu c\u00edli.<\/p>\n<h2>Odposlech - P\u0159\u00edchoz\u00ed provoz - P\u0159esm\u011brov\u00e1n\u00ed hovor\u016f<\/h2>\n<p>Zpr\u00e1va registerSS se pou\u017e\u00edv\u00e1 k registraci dopl\u0148kov\u00fdch slu\u017eeb pro \u00fa\u010dastn\u00edka. Jednou z t\u011bchto slu\u017eeb je slu\u017eba p\u0159esm\u011brov\u00e1n\u00ed vol\u00e1n\u00ed. \u00dato\u010dn\u00edk m\u016f\u017ee pomoc\u00ed zpr\u00e1vy registerSS povolit p\u0159esm\u011brov\u00e1n\u00ed hovor\u016f na \u010d\u00edslo, kter\u00e9 m\u00e1 pod kontrolou. Po p\u0159ijet\u00ed hovoru pak \u00fato\u010dn\u00edk pou\u017eije zpr\u00e1vu eraseSS k odstran\u011bn\u00ed p\u0159esm\u011brov\u00e1n\u00ed hovoru a n\u00e1sledn\u00e9mu p\u0159esm\u011brov\u00e1n\u00ed hovoru zp\u011bt na \u00fa\u010dastn\u00edka. T\u00edmto zp\u016fsobem m\u016f\u017ee \u00fato\u010dn\u00edk hovor zachytit a nahr\u00e1t.<\/p>","protected":false},"excerpt":{"rendered":"<p>Mobiln\u00ed \u00fast\u0159edna MSC obvykle uchov\u00e1v\u00e1 \u0161ifrovac\u00ed kl\u00ed\u010de pou\u017e\u00edvan\u00e9 jednotliv\u00fdmi \u00fa\u010dastn\u00edky, aby bylo mo\u017en\u00e9 nav\u00e1zat hovor. Kdy\u017e je \u00fa\u010dastn\u00edk na cest\u00e1ch, proces p\u0159ed\u00e1n\u00ed usnad\u0148uje hladk\u00fd p\u0159echod \u00fa\u010dastn\u00edka mezi r\u016fzn\u00fdmi r\u00e1diov\u00fdmi bu\u0148kami a z\u00e1rove\u0148 zachov\u00e1v\u00e1 pr\u016fb\u011bh hovoru. V n\u011bkter\u00fdch p\u0159\u00edpadech se \u00fa\u010dastn\u00edk p\u0159esouv\u00e1 z...<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68],"tags":[],"class_list":["post-360","post","type-post","status-publish","format-standard","hentry","category-call-interception"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v26.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SS7 Call Interception<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sms-txt.net\/cs\/zachyceni-hovoru\/ss7-zachyceni-volani\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SS7 Call Interception\" \/>\n<meta property=\"og:description\" content=\"The mobile switching center MSC normally holds the encryption keys used by each subscriber to be able to establish the call. 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